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Purple Eronzing for Zinc
Immerse in a boiling infusion of logwood. 3817. Larkin's Bronzing Fluids for Alloys of a Silvery-Grey Color. Mr.
Larkin states that, for the purpose of rendering alloys which are of a silvery-grey color, perfectly suitable as substitutes for copper, bronze, brass, and other metals, the color ounce oxalic acid, in 1 pint water, brought proper to the metals which they are intended to the boil, and then cooled. Or: 1 pint to substitute is imparted to them by means solution of ferrocyanide of potassium and 3 drachms nitric acid. This latter is slow in action, taking an hour to produce good results. 3801. Dark Brown Bronzing for Brass. Mix 1 ounce cyanide of potassium, and 4 drachms nitric acid, with 1 pint water.